electrical - 240v L14-30R wiring air compressor switch - Home Improvement Stack Exchange

I purchased a Campbell Hausfeld 6 hp 60 gallon DK400121AV. It's supposed to run on 240v, but the guy I bought it from had a 120v plug wired to it. How do I wire a L14-30P plug to the pressure switch?

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3 different ways to wire a compressors Pressure Switch

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electrical - 240v L14-30R wiring air compressor switch - Home Improvement Stack Exchange

electrical - 240v L14-30R wiring air compressor switch - Home Improvement Stack Exchange

3 different ways to wire a compressors Pressure Switch

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Coleman Cable 01934 3-Feet Generator Power Cord Adapter, 10/4 Splitter Y Adapter, L14-30P to (2) 10/3 Lighted 5-20R : Patio, Lawn & Garden

How To Wire A Pressure Switch - MASTERTOOLREPAIR.COM

electrical - Can I share a 240V outlet between two devices? - Home Improvement Stack Exchange